[llvm-bugs] [Bug 47773] New: [PCH] contents of header file is fully read with -g despite compiling with pch

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47773

            Bug ID: 47773
           Summary: [PCH] contents of header file is fully read with -g
                    despite compiling with pch
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Wolfgang_Pieb at playstation.sony.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Created attachment 24037
  --> https://bugs.llvm.org/attachment.cgi?id=24037&action=edit
Test case

With -g the frontend seems to read the contents of a header file in its
entirety even when compiling with pch. This happens as part of the effort to
establish source locations for entities (a type in the attached test case) for
which debug locations are emitted. SourceManager::getPresumedLoc() attempts to
compute line numbers and in the process reads the header file.

The attached test case is for linux and uses the utility inotifywait to
demonstrate the file access (a stat call does not trigger a notification BTW,
only a read).

Set CLANG to a recently built clang and do

make; make all

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